221311311123 has 64 divisors (see below), whose sum is σ = 360997060608. Its totient is φ = 117722626560.

The previous prime is 221311311071. The next prime is 221311311127. The reversal of 221311311123 is 321113113122.

It is not a de Polignac number, because 221311311123 - 2⁹ = 221311310611 is a prime.

It is a super-2 number, since 2×221311311123² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 221311311123.

It is not an unprimeable number, because it can be changed into a prime (221311311127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14999836 + ... + 15014582.

It is an arithmetic number, because the mean of its divisors is an integer number (5640579072).

Almost surely, 2^221311311123 is an apocalyptic number.

221311311123 is a deficient number, since it is larger than the sum of its proper divisors (139685749485).

221311311123 is a wasteful number, since it uses less digits than its factorization.

221311311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15232.

The product of its digits is 216, while the sum is 21.

Adding to 221311311123 its reverse (321113113122), we get a palindrome (542424424245).

The spelling of 221311311123 in words is "two hundred twenty-one billion, three hundred eleven million, three hundred eleven thousand, one hundred twenty-three".